Port numbers can be a struggle to learn and remember. With each new Security+ exam, CompTIA changes the ports and protocols that you need to remember on the exam.
As a CompTIA Authorized Partner, Cyberkraft has created an informational reference guide to help you remember the ports and protocols that you will need for your SY0-601 Security+ exam.
Use this guide to study the essential ports and protocols needed on the exam. We know that it can be hard to remember everything and want to help you as much as possible.
The reference sheet below has been customized for the SY0-601 Security+ exam so you won’t have to waste your time learning additional, unnecessary ports. We’ve included a basic summary of each protocol so you can quickly identify the key features.
We have even sorted the protocols by their location within the OSI model to help you understand how they function. Click the button below to download a PDF copy of the Security+ 601 Ports and Protocols Reference Sheet.
|Layer 7 Application||Port Number||Use|
|File Transfer Protocol (FTP)||20/21||Port 21 is the control port while port 20 is used to transfer files.|
|Secure Shell (SSH)||22||Designed to transmit data through a remote connection.|
|SSH File Transfer Protocol||22||A completely separate protocol from FTP (it is not compliant with FTP servers) that uses SSH to encrypt file transfers.|
|TACACS+||49||Cisco proprietary protocol used for authentication, authorization, and accounting (AAA) services|
|Domain Name System (DNS)||53||Used to associate IP addresses with domain names|
|Dynamic Host Configuration Protocol (DHCP)||67/68||This network management protocol is used to assign local IP addresses to devices on a network. It is used to create multiple private IP addresses from one public IPv4 address.|
|Hypertext Transfer Protocol (HTTP)||80||Protocol used for websites and most internet traffic.|
|Kerberos||88||Network authentication protocol that allows for communication over a non-secure network.|
|Post Office Protocol (POP)||110||E-mail protocol that allows e-mail clients to communicate with e-mail servers. POP provides only one-way communication.|
|Internet Message Access Protocol (IMAP)||143, 993||E-mail protocol used by e-mail clients to communicate with e-mail servers. Provides two way communication unlike POP.|
|Simple Network Management Protocol (SNMP)||161/162||Protocol used to monitor and manage network devices on IP networks.|
|Lightweight Directory Access Protocol (LDAP)||389||Used to manage and communicate with directories.|
|Hypertext Transfer Protocol Secure (HTTPS)||443||Secure version of HTTP that used TLS for encryption. Most websites use HTTPS instead of HTTP.|
|Lightweight Directory Access Protocol Secure (LDAPS)||636||Secure version of LDAP that uses TLS for encryption.|
|File Transfer Protocol Secure (FTPS)||989/990||FTPS uses TLS for encryption. It can run on ports 20/21 but is sometimes allocated to ports 989/990.|
|Internet Message Access Protocol Secure (IMAPS)||993||Secure version of IMAP that uses TLS for encryption.|
|Post Office Protocol 3 Secure (POP3S)||995||Secure version of POP that uses TLS for encryption.|
|Remote Authentication Dial-In User Service (RADIUS)||1812, 1813||Used to provide AAA for network services|
|Diameter||3868||Developed as an upgrade to Radius|
|Secure Real Time Protocol (SRTP)||5004||SRTP replaced RTP and is a protocol used to stream audio and video communication using UDP.|
|Layer 5 Session Layer||Port Number||Use|
|Layer 2 Tunneling Protocol (L2TP)||1701||Used to create point to point connections, like VPNs over a UDP connection. Needs IPSec for encryption. Designed as an extension to PPTP. Operates at the data link layer but encapsulates packets at the session layer.|
|Layer 4 Transport||Port Number||Use|
|Transmission Control Protocol (TCP)||N/A||One of two main protocols of the Internet Protocol (IP) suite used to transmit data over an IP network. TCP provides error checking to ensure packets are not lost in transit.|
|User Datagram Protocol (UDP)||N/A||The second main protocol in the IP suite that transmits datagrams in a best effort method. UDP does not include error checking.|
|Point to Point Tunneling Protocol (PPTP)||1723||Based on PPP. Deprecated protocol for VPNs.|
|Remote Desktop Protocol||3389||Windows proprietary protocol that provides a remote connection between two computers.|
|Layer 2 Data Link Layer||Port Number||Use|
|Point to Point Tunneling Protocol||1723||Based on PPP. Deprecated protocol for VPNs.|
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